7a-8=9a

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Solution for 7a-8=9a equation:


Simplifying
7a + -8 = 9a

Reorder the terms:
-8 + 7a = 9a

Solving
-8 + 7a = 9a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-9a' to each side of the equation.
-8 + 7a + -9a = 9a + -9a

Combine like terms: 7a + -9a = -2a
-8 + -2a = 9a + -9a

Combine like terms: 9a + -9a = 0
-8 + -2a = 0

Add '8' to each side of the equation.
-8 + 8 + -2a = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -2a = 0 + 8
-2a = 0 + 8

Combine like terms: 0 + 8 = 8
-2a = 8

Divide each side by '-2'.
a = -4

Simplifying
a = -4

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